Drop support for Python 3.8

.github/workflows/test.yml

@@ -44,15 +44,15 @@ jobs:
           - optional
         include:
           - dependencies: oldest
-            python: "3.8"
+            python: "3.9"
           - dependencies: latest
             python: "3.11"
           - dependencies: optional
             python: "3.11"
-          # test on macos-13 (x86) using oldest dependencies and python 3.8
+          # test on macos-13 (x86) using oldest dependencies and python 3.9
           - os: macos-13
             dependencies: oldest
-            python: "3.8"
+            python: "3.9"
         exclude:
           # don't test on macos-latest (arm64) with oldest dependencies
           - os: macos-latest

doc/compatibility.rst

@@ -64,3 +64,5 @@ following releases to ensure compatibility:
       - 0.4.0
     * - 3.7
       - 0.6.0
+    * - 3.8
+      - 0.6.0

doc/install.rst

@@ -42,7 +42,7 @@ There are different ways to install Harmonica:
 Which Python?
 -------------
 
-You'll need **Python 3.8 or greater**.
+You'll need **Python 3.9 or greater**.
 See :ref:`python-versions` if you require support for older versions.
 
 Dependencies

pyproject.toml

@@ -22,18 +22,17 @@ classifiers = [
     "Topic :: Scientific/Engineering",
     "Topic :: Software Development :: Libraries",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "numpy >= 1.21",
-    "pandas >= 1.1",
-    "scipy >= 1.5",
+    "pandas >= 1.4",
+    "scipy >= 1.9",
     "scikit-learn >= 0.24",
-    "numba >= 0.52",
+    "numba >= 0.53",
     "xarray >= 0.16",
     "verde >= 1.7",
     "xrft >= 1.0",